Modular adapter for testing telephone circuits



FIG. 1 is a front and upper right perspective view of a modular adapter for testing telephone circuits showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof, the right side elevational view thereof being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for modular adapter for testing telephone circuits, as shown and described. 